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Frequency and intensity of nitrogen addition alter soil inorganic sulfur fractions, but the effects vary with mowing management in a temperate steppe

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Figure 1. Conceptual scheme depicting the transformation of sulfur (S) fractions in aerobic calcareous soils
Table 1. Effects of N addition and mowing on soil pH, soil organic carbon (SOC), and total inorganic nitrogen (TIN)
Figure 2. Effects of N addition intensity and frequency on concen-solid regression lines represent 2 and 12 N additions per year, re-trations of soil-soluble S (a, b), adsorbed S (c, d), and insoluble S(e, f) in unmown (a, c, e)) and mown plots (b, d, f)
Table 2. Results of three-way ANOVAs (F value) for the effects of mowing (M), N addition frequency (F), and intensity (N) on soil sulfur(S) fractions and total S concentration.
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